I thought that Jango Fett was the model for the clones and the Geonosians modeled the droids after themselves. But read StarWarsShop's description (copy-and-pasted below for your convenience) to discover the truth.
Jango Fett is commissioned by Lord Tyranus to be the template for a massive droid army being built in secret on Kamino. His extensive career as a bounty hunter is put to an end at the Battle of Geonosis at the hands of Mace Windu, leaving his one unaltered clone Boba to carry on the family bounty hunter tradition. Includes grappling hook and removable helmet."